NEET Physics: universal law of gravitation Practice Questions
14 free multiple-choice questions on universal law of gravitation (Gravitation) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which of the following quantities is constant according to the Universal Law of Gravitation?
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Correct answer: B — The gravitational constant G
The Universal Law of Gravitation states that the force is proportional to the product of the masses and inversely proportional to the square of the distance. The constant of proportionality, G (the gravitational constant), is the only universal constant in this law.
Q2. Which quantity is directly related to the strength of the gravitational attraction between two bodies, according to Newton's Law of Gravitation?
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Correct answer: D — The value of the universal gravitational constant
The gravitational force is directly proportional to the product of the masses and the universal gravitational constant (F ∝ G m₁ m₂ / r²). Therefore, the value of G determines the strength of the attraction.
Q3. The universal gravitational constant (G) is a fundamental constant that determines:
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Correct answer: C — the strength of the gravitational force between any two objects
G is the proportionality constant in the universal law of gravitation (F = G m₁ m₂ / r²). It quantifies the fundamental strength of gravity between any pair of masses.
Q4. If the masses of two objects are increased by a factor of 3, and the distance between them remains the same, the gravitational force between them will be:
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Correct answer: A — 9 times
Since the force is directly proportional to the product of the masses (F ∝ m₁ m₂), if both masses are multiplied by 3, the force will be multiplied by 3 × 3 = 9 times.
Q5. The gravitational force between two objects is inversely proportional to the square of the distance between their centers. This is a key feature of the universal law of gravitation. What does this imply about the force if the distance between the objects is doubled?
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Correct answer: A — The force becomes one-fourth
Since Force F ∝ 1/r², if the distance r is doubled (2r), the new force F' ∝ 1/(2r)² = 1/(4r²). Thus, the force becomes one-fourth of the original force.
Q6. The gravitational force between two bodies is inversely proportional to the square of the distance between their centers. This statement is derived from which fundamental law?
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Correct answer: D — Universal Law of Gravitation
The Universal Law of Gravitation states that the force of attraction between two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Q7. If the mass of one of the interacting bodies is tripled, while the distance remains the same, how does the gravitational force change?
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Correct answer: D — It triples
Since F ∝ m₁ m₂, if m₁ is tripled and m₂ is constant, the gravitational force will also triple.
Q8. Which of the following statements correctly describes the nature of the gravitational force?
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Correct answer: C — It is always attractive and acts between any pair of masses.
Gravitational force is an attractive force that exists between any two masses throughout space, and it is always attractive.
Q9. The gravitational force is inversely proportional to the square of the distance between the two masses. This relationship is known as:
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Correct answer: C — Inverse square law
The mathematical relationship describing how the gravitational force changes with distance is F ∝ 1/r², which is the definition of the inverse square law.
Q10. If the distance between two masses is doubled, the gravitational force of attraction between them will change by a factor of:
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Correct answer: A — 1/4
The gravitational force is inversely proportional to the square of the distance (F ∝ 1/r²). If the distance (r) is doubled (2r), the new force F' ∝ 1/(2r)² = 1/(4r²). Thus, the force changes by a factor of 1/4.
Q11. The Universal Gravitational Constant (G) is the proportionality constant in the Law of Gravitation. What is its value in SI units?
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Correct answer: B — 6.67 × 10⁻¹¹ N m²/kg²
The value of the Universal Gravitational Constant (G) is 6.674 × 10⁻¹¹ N m²/kg². This constant relates the masses and distances in the Universal Law of Gravitation (F = G(m₁ m₂)/r²).
Q12. The Universal Law of Gravitation is applicable to:
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Correct answer: D — All objects in the universe
The law states that every particle attracts every other particle in the universe, regardless of whether they are stationary or in motion, provided they have mass.
Q13. If the masses of two objects are doubled while keeping the distance between them constant, the gravitational force between them will become:
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Correct answer: C — Four times the original force
According to the law, F ∝ m₁ m₂. If both masses are doubled (2m₁ and 2m₂), the new force will be (2m₁)(2m₂) = 4 m₁ m₂, meaning the force becomes four times the original force.
Q14. If the distance between two masses is tripled, the gravitational force of attraction between them will be reduced by a factor of:
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Correct answer: B — 1/3
The gravitational force is inversely proportional to the square of the distance (F ∝ 1/r²). If the distance is tripled (r → 3r), the force becomes F' ∝ 1/(3r)² = 1/(9r²). Thus, the force is reduced by a factor of 9 (or divided by 9).
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